Nice Alex, but yeah wouldn't pay that at Tiffany's LOL
In regards to the quality of diamonds, the cut is the most important. This determines the brightness or amount of light reflected back in a diamond.
In regards to colour G/H/I I doubt you'd be able to tell the difference to a D/E/F. As with clarity si2 or vs2 should be sufficient. As long as the inclusions are not visible to the naked eye.
A 1 carat, IF, D colour would be say $15,000
A 1 carat, Si2, H colour would be say $6,000
And to the general public under a naked eye you wouldn't be able to tell the difference